The cable part is a standard USB to microUSB. I saw some just yesterday in a CVS. I'm sure you could find those in Walmart, Target, Best Buy, Kmart, etc.

Or you can get the real white cable at Amazon

http://www.amazon.com/Replacement-Cable-...

You can connect that to the USB port of a computer OR more people prefer a faster charger like

http://www.amazon.com/CrazyOnDigital-Cha...

Or you can get this Amazon type

http://www.amazon.com/Adapter-included-C...

They use the micro-USB connection, so any place that sells those for other devices is a good place to start. The days of proprietary chargers and connections are gone (well, almost, since Apple hasn't bought into that yet).

probably on Amazon.com - the makers of the Kindle

amazon